package com.heima.kafka.sample;

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.clients.producer.ProducerConfig;

import java.time.Duration;
import java.util.Collections;
import java.util.Properties;

/**
 * 消息的消费者
 */
public class ConsumerQuickStart {

    public static void main(String[] args) {

        //kafka配置
        Properties properties = new Properties();
        //链接哪个kafka
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"192.168.200.130:9093,192.168.200.130:9094");
        //消息的key和value的序列化
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");
        //指定分组
        properties.put(ConsumerConfig.GROUP_ID_CONFIG,"group-02");
        //设置手动提交偏移量
        properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG,"false");

        //创建消费者对象
        KafkaConsumer<String,String> consumer = new KafkaConsumer<String, String>(properties);
        //订阅消息
        consumer.subscribe(Collections.singletonList("kafka-first-topic"));
        while (true){
            //接收消息
            ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofSeconds(1));
            for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                System.out.println(consumerRecord.partition());
                System.out.println(consumerRecord.key());
                System.out.println(consumerRecord.value());

                //手动提交偏移量
                consumer.commitSync();
            }
        }

    }
}
